All of these "tricks" to exchange the contents of two variables, while possessing a
certain elegance, share one common defect. They are tricky. Days, weeks and months
later they can and likely will be difficult to understand. This kind of trickiness
may have a place deep in the internals of a package such as PHP or an OS kernel, but
in a routine to edit user inputs clarity is probably a more important virtue. I
suggest the best way to handle the situation originally posted would be something
like:
if $userFromDate > $userToDate {
$sqlFromDate = $userToDate;
$sqlToDate = $userFromDate;
}
else {
$sqlToDate = $userToDate;
$sqlFromDate = $userFromDate;
}
"Tricks" obviously do make interesting discussion topics though.
~~LF
----- Original Message -----
From: Sean Bright
To: [EMAIL PROTECTED]
Sent: Saturday, January 13, 2001 10:01 AM
Subject: Re: [PHP-WIN] Simple question that I can't find the answer to
Yeah, but you could run into overflow problems with large values of a
and b.
Sean
Jan Walter wrote:
>
> If you are working with numbers, which is perhaps not your case, you can use
> this simple trick to swith values of $a and $b:
>
> $a = $a + $b;
> $b = $a - $b;
> $a = $a - $b;
> --
>
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> Jan Walter, called John
> LERACH, s.r.o.
> phone nr. work: +420-2-78 22 619, home: +420-2-35 35 27 61
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